#container { width: 400px; 
             margin-left: auto; 
             margin-right: auto; 
}

#banner { height: 150px;
          width: 100%;
          background-color: red;
}

#navbar { width: 150px; 
          min-height: 400px;
          float: left;
          background-color: yellow;
}

#content { width: 250px; 
           /* min-height: 400px; */
           clear: right;
           float:right; 
           background-color: orange;
}

#footer { height: 150px; 
          width: 100%;
          clear; both;
          float:left;
          background-color: blue;
}